use Invariant Culture for Lower/Upper conversion

Author: ahmad-moussawi

QueryBuilder/Compilers/Compiler.cs

@@ -782,7 +782,7 @@ private InvalidCastException InvalidClauseException(string section, AbstractClau
 
         protected string checkOperator(string op)
         {
-            op = op.ToLower();
+            op = op.ToLowerInvariant();
 
             var valid = operators.Contains(op) || userOperators.Contains(op);
 
@@ -802,9 +802,9 @@ protected string checkOperator(string op)
         public virtual string Wrap(string value)
         {
 
-            if (value.ToLower().Contains(" as "))
+            if (value.ToLowerInvariant().Contains(" as "))
             {
-                var index = value.ToLower().IndexOf(" as ");
+                var index = value.ToLowerInvariant().IndexOf(" as ");
                 var before = value.Substring(0, index);
                 var after = value.Substring(index + 4);
 

QueryBuilder/Compilers/OracleCompiler.cs

@@ -136,7 +136,7 @@ protected override string CompileBasicDateCondition(SqlResult ctx, BasicDateCond
                 case "hour":
                 case "minute":
                 case "second":
-                    sql = $"EXTRACT({condition.Part.ToUpper()} FROM {column}) {condition.Operator} {value}";
+                    sql = $"EXTRACT({condition.Part.ToUpperInvariant()} FROM {column}) {condition.Operator} {value}";
                     break;
                 default:
                     sql = $"{column} {condition.Operator} {value}";